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Spanning Tree
CST Configuration
Use the Spanning Tree CST Configuration page to configure the Common Spanning Tree (CST) set-
tings. The settings and information on this page define the device within the spanning tree topology
that connects all STP/RSTP bridges and MSTP regions.
To display the CST Configuration page, click
Switching
>
Spanning Tree
in the navigation pane, and
then click the
CST
tab.
Figure 29. Spanning Tree CST Configuration Page
Table 19. Spanning Tree CST Configuration Fields
Field
Description
Bridge Priority
The value that helps determine which bridge in the spanning tree is elected as the root bridge
during STP convergence. A lower value increases the probability that the bridge becomes the
root bridge.
Bridge Max Age
The amount of time a bridge waits before implementing a topological change.
Bridge Hello Time
The amount of time the root bridge waits between sending hello BPDUs.
Bridge Forward Delay
The amount of time a bridge remains in a listening and learning state before forwarding
packets.
Spanning Tree Maximum
Hops
The maximum number of hops a Bridge Protocol Data Unit (BPDU) is allowed to traverse
within the spanning tree region before it is discarded.
